Answer
At point $A$.
Work Step by Step
Since at point $A$, it has shorter temperature distance from one level curve to the other than at point $B$ does, it is more sensitive to a change in temperature.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 15 - Differentiation in Several Variables - 15.1 Functions of Two or More Variables - Exercises - Page 765: 47
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